The Accidental Tourist (1988) - 'Wedding Scene'

Wedding scenes are always a bit special. Emotions are charged, everyone looks their best, people reflect about life. Add a dose of sunshine, and things become almost ethereal. But there's a lot of subtext going on here, and John Williams' theme manages to capture that vein of uncertainty.
Starring William Hurt, Kathleen Turner, Geena Davis (in an Oscar-winning role) and Bill Pullman. Screenplay by Frank Galati and Lawrence Kasdan, based on the novel by Anne Tyler. Directed by Lawrence Kasdan, with an original score by John Williams.

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This is when he feels himself being pulled back to be with his estranged wife.